Radial air bearing system for a gas compressor

Abstract

The present application relates to the technical field of radial air bearing, and particularly relates to a radial air bearing system of a gas compressor. The radial air bearing adopts a gas suspension radial air bearing, which comprises a first elastic wave foil, a second elastic wave foil and a top foil which are sequentially stacked from outside to inside, and the second elastic fin is stacked with the first elastic fin to improve the bearing capacity; cooling gas in the motor cavity enters the inner hole of the bearing seat through the heat dissipation channel to cool the radial air bearing; the bending part is fixedly connected with the positioning rod, one end of the positioning rod is fixedly connected with the bearing gland, the bearing gland is fixedly connected with the bearing seat, the side wall of the inner hole of the bearing seat is provided with a slot matched with the bending part and the positioning rod, and the end of the side wall of the inner hole of the bearing seat away from the bearing gland is provided with a stop table matched with the radial air bearing. The radial air bearing can greatly improve the bearing capacity, has good cooling effect, fast heat dissipation, low failure rate, improves the stability of the radial air bearing during use, and ensures the supporting effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radial air bearing, in particular to a radial air bearing system of gas compressor. BACKGROUND

[0002] At present, in the high-speed centrifugal air compressor, the radial force of the main shaft is mainly borne by the radial air bearing, the radial air bearing is a self-acting dynamic pressure air bearing using air as the lubricating medium, and the structure mainly comprises a top foil and a wave foil. One end of the top foil is provided with a bent portion as a fixed end, and the other end is a free end. The wave foil is arranged in the inner hole of the bearing seat and is attached to the inner hole wall of the bearing seat in the circumferential direction. The top foil is arranged in the wave foil and is attached to the wave foil in the circumferential direction. The main shaft is located inside the top foil, and a high-pressure gas layer is formed between the main shaft and the top foil. However, the radial air bearing with this structure has the following disadvantages in actual use:

[0003] Firstly, when bearing the radial force, the radial force bearing capacity is low, the stability is not good, the consistency is poor, the bearing capacity is uneven, and the long-time working environment of the high-speed centrifugal air compressor cannot be met.

[0004] Secondly, the cooling effect of the bearing in the working process is poor, mainly relying on the natural ventilation and heat dissipation through the gap between the bearing and the inner hole of the bearing seat, the service life of the bearing is short, and the bearing is easy to be damaged.

[0005] Thirdly, when fixing the bent portion of the top foil, the bent portion is generally pressed and fixed by a positioning pin penetrating through a positioning hole on the bearing seat. On the one hand, the positioning pin is easy to loosen, which causes the bent portion to be not firmly fixed, and the top foil loses the fixed support, so that the whole radial bearing capacity of the bearing is affected. On the other hand, there is no positioning structure at both ends of the bearing, and when the positioning pin is loosened, the displacement in the axial direction is easy to occur, and the risk of support failure is serious. The above two points will affect the stability of the radial air bearing in use, and affect the radial support effect. At present, there is no good way to solve the above problems.

[0006] In summary, the above problems of the radial air bearing in the use process have become a technical problem that needs to be solved in the industry. SUMMARY

[0007] In order to make up for the shortcomings of the prior art, the present application provides a radial air bearing system of gas compressor, which solves the problems of low radial force bearing capacity, poor stability, uneven bearing capacity of the previous radial air bearing, solves the problems of poor cooling effect, short service life and easy damage of the previous radial air bearing, and solves the problems of poor fixation in the radial direction and the axial direction and easy displacement of the previous radial air bearing.

[0008] The technical scheme adopted by the present application to solve the above technical problems is:

[0009] A radial air bearing system of a gas compressor, comprising a motor, the motor end connects a compression pump head, the motor comprises a shell, the shell is provided with a stator and a main shaft, the both ends of the main shaft are supported by a bearing seat, a radial air bearing is arranged between the bearing seat and the main shaft, the radial air bearing adopts a gas suspension radial air bearing, comprising a first elastic wave foil, a second elastic wave foil and a top foil which are sequentially stacked from outside to inside, one end of the first elastic wave foil, the second elastic wave foil and the top foil is provided with a bending part as a fixed end, and the other end is a free end, a plurality of first elastic fins inclined outward are arranged on the first elastic wave foil, a plurality of perforated holes are arranged on the periphery of each first elastic fin, a second elastic fin inclined outward is arranged on the second elastic wave foil at a position corresponding to each first elastic fin, and the second elastic fin and the first elastic fin are stacked to improve the bearing capacity.

[0010] The side wall of the bearing seat near the motor cavity is provided with a boss, a plurality of heat dissipation channels for connecting the inner hole of the bearing seat and the motor cavity are arranged on the boss in the circumferential direction, and the cooling gas in the motor cavity enters the inner hole of the bearing seat through the heat dissipation channels to cool the radial air bearing.

[0011] The bending part is fixedly connected with the positioning rod, one end of the positioning rod is fixedly connected with the bearing pressing cover, the bearing pressing cover is fixedly connected with the bearing seat, the side wall of the inner hole of the bearing seat is provided with a slot matched with the bending part and the positioning rod, and the end of the side wall of the inner hole of the bearing seat away from the bearing pressing cover is provided with a stop table matched with the radial air bearing.

[0012] The inclination direction of the second elastic fin is opposite to that of the first elastic fin.

[0013] The size of the first elastic fin is larger than that of the second elastic fin.

[0014] The perforated hole is a square hole, two first elastic fins are arranged in each square hole, and the inclination directions of the two first elastic fins are opposite.

[0015] The corresponding positions of the first elastic wave foil, the second elastic wave foil and the top foil are provided with error prevention holes.

[0016] The bending part is provided with a plurality of fixing holes, the positioning rod is inserted and assembled in the fixing holes through the column pins on the upper surface of the positioning rod to be connected with the bending part.

[0017] The slot comprises a square slot and an arc slot which are connected, the bending part and the positioning rod are inserted and assembled in the square slot, and the column pins are inserted and assembled in the arc slot.

[0018] The bearing pressing cover, the positioning rod and the column pin are integrally formed.

[0019] The bearing gland is fixedly connected with the bearing seat by screws.

[0020] The shell is provided with a cooling gas inlet and a cooling gas outlet.

[0021] The application has the following advantages:

[0022] By arranging a plurality of outwardly inclined first elastic fins on the first elastic wave foil and a plurality of outwardly inclined second elastic fins on the second elastic wave foil corresponding to the positions of the first elastic fins, the radial force is borne by the elastic deformation of the first elastic wave foil and the second elastic wave foil on the one hand, and by the elastic deformation of the first elastic fins and the second elastic fins on the other hand, so that the radial force bearing capacity is greatly improved. In addition, the first elastic fins and the second elastic fins are evenly arranged on the first elastic wave foil and the second elastic wave foil, which not only makes the bearing capacity more uniform, improves stability and consistency, but also greatly improves the bearing capacity after the second elastic fins and the first elastic fins are superimposed, which can meet the long-time working environment requirements of high-speed centrifugal air compressors.

[0023] By arranging a boss on the side wall of the bearing seat near the motor cavity and a plurality of heat dissipation channels in the boss to connect the inner hole of the bearing seat and the motor cavity, the cooling gas can enter the inner hole of the bearing seat through the heat dissipation channels to cool the radial air bearing, which has good cooling effect, fast heat dissipation, low failure rate and long service life of the radial air bearing.

[0024] By arranging a positioning rod in the slot of the inner hole of the bearing seat, the positioning rod fixes the bent part of the radial air bearing, which can realize the fixed installation of the bent part in the radial direction and effectively avoid displacement of the bent part in the radial direction. By limiting the two ends of the radial air bearing by the bearing gland and the retaining table, the fixed installation of the radial air bearing in the axial direction can be realized, which effectively avoids displacement of the radial air bearing in the axial direction, thereby improving the stability of the radial air bearing during use and ensuring its supporting effect. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a sectional view of the structure of the application.

[0026] Figure 2 It is a perspective view of the gas-suspended radial air bearing of the application.

[0027] Figure 3 It is a sectional view of the gas-suspended radial air bearing of the application.

[0028] Figure 4 It is a structure diagram of the first elastic wave foil of the application.

[0029] Figure 5 The second elastic wave foil structure schematic diagram of the present application.

[0030] Figure 6 The local enlarged structure schematic diagram in Figure 2

[0031] Figure 7 The bearing seat part three-dimensional structure schematic diagram of the present application.

[0032] Figure 8 The bearing seat boss position section structure schematic diagram of the present application.

[0033] Figure 9 The bearing seat body position section structure schematic diagram of the present application.

[0034] Figure 10 The bearing seat three-dimensional structure schematic diagram of the present application.

[0035] Figure 11 The bearing gland and air suspension radial air bearing combined structure schematic diagram of the present application.

[0036] Figure 12 The bearing gland structure schematic diagram of the present application.

[0037] In the figure, 1, the shell, 2, the stator, 3, the main shaft, 4, the bearing seat, 5, the radial air bearing, 6, the first elastic wave foil, 7, the second elastic wave foil, 8, the top foil, 9, the bending part, 10, the first elastic fin, 11, the fret, 12, the second elastic fin, 13, the boss, 14, the heat dissipation channel, 15, the positioning rod, 16, the bearing gland, 17, the blocking table, 18, the anti-mist hole, 19, the fixed hole, 20, the column pin, 21, the square groove, 22, the arc-shaped groove. DETAILED DESCRIPTION

[0038] In order to clearly illustrate the technical features of the present application, the present application will be described in detail below through specific embodiments, and combined with its accompanying drawings.

[0039] As Figures 1-12 ​The radial air bearing system of the gas compressor shown comprises a motor connected with a compression pump head at the end of the motor, the motor comprises a shell 1, a stator 2 and a main shaft 3 are arranged in the shell 1, the two ends of the main shaft 3 are supported by a bearing seat 4, a radial air bearing 5 is arranged between the bearing seat 4 and the main shaft 3, the radial air bearing 5 adopts a gas suspension radial air bearing, comprising a first elastic wave foil 6, a second elastic wave foil 7 and a top foil 8 which are sequentially stacked from outside to inside, one end of the first elastic wave foil 6, the second elastic wave foil 7 and the top foil 8 is provided with a bending part 9 as a fixed end, and the other end is a free end, a plurality of first elastic fins 10 inclined outward are arranged on the first elastic wave foil 6, a perforated hole 11 is arranged on the periphery of each first elastic fin 10, a second elastic fin 12 inclined outward is arranged on the second elastic wave foil 7 at a position corresponding to each first elastic fin 10, and the second elastic fin 12 is stacked with the first elastic fin 10 to improve the bearing capacity.

[0040] The side wall of the bearing seat 4 close to the motor cavity is provided with a boss 13, a plurality of heat dissipation channels 14 connecting the inner hole of the bearing seat 4 and the motor cavity are arranged in the boss 13 in the circumferential direction, and the cooling gas in the motor cavity enters the inner hole of the bearing seat 4 through the heat dissipation channels 14 to cool the radial air bearing 5.

[0041] The bending part 9 is fixedly connected with a positioning rod 15, one end of the positioning rod 15 is fixedly connected with a bearing pressing cover 16, the bearing pressing cover 16 is fixedly connected with the bearing seat 4, the side wall of the inner hole of the bearing seat 4 is provided with a slot matched with the bending part 9 and the positioning rod 15, and the end of the side wall of the inner hole of the bearing seat 4 away from the bearing pressing cover 16 is provided with a stop table 17 matched with the radial air bearing 5.

[0042] The inclination direction of the second elastic fin 12 is opposite to that of the first elastic fin 10, when the first elastic fin 10 is extruded and deformed by the radial force, the first elastic fin 10 is displaced inward and can abut against the second elastic fin 12, at this time, the second elastic fin 12 is stacked with the first elastic fin 10, and can bear greater radial load.

[0043] The size of the first elastic fin 10 is greater than that of the second elastic fin 12, the first elastic fin 10 is in contact with the inner hole wall of the bearing seat 4 on the outside, the second elastic fin 12 is located on the inside of the first elastic fin 10, and the first elastic fin 10 can completely cover the second elastic fin 12 on the inside.

[0044] The perforated hole 11 is a square hole, two first elastic fins 10 are arranged in each square hole, the number of the first elastic fins 10 can be increased, so that the bearing capacity is improved, the inclination directions of the two first elastic fins 10 are opposite, the bearing capacity is more uniform, and the stability and consistency are improved.

[0045] The first elastic wave foil 6, the second elastic wave foil 7 and the top foil 8 are provided with error-proof holes 18 at corresponding positions, which play a positioning role during assembly.

[0046] The bending part 9 is provided with a plurality of fixing holes 19, and the positioning rod 15 is inserted into the fixing holes 19 through the upper pin 20 to be connected with the bending part 9.

[0047] The slot includes a square slot 21 and an arc slot 22 connected with each other, the bending part 9 and the positioning rod 15 are inserted into the square slot 21, and the pin 20 is inserted into the arc slot 22.

[0048] The bearing gland 16, the positioning rod 15 and the pin 20 are integrally formed.

[0049] The bearing gland 16 is fixedly connected with the bearing seat 4 through a plurality of screws.

[0050] The shell 1 is provided with a cooling gas inlet and a cooling gas outlet, and cooling gas can be introduced into the motor cavity.

[0051] Working principle:

[0052] When the radial air bearing 5 is installed with the bearing seat 4, the pin 20 on the positioning rod 15 is inserted through the fixing hole 19 on the bending part 9, the bearing gland 16, the positioning rod 15 and the radial air bearing 5 are assembled into one body, then the above combination is assembled with the bearing seat 4, so that the radial air bearing 5 is located in the inner hole of the bearing seat 4, the bending part 9 and the positioning rod 15 are inserted into the square slot 21, the pin 20 is inserted into the arc slot 22, finally the bearing gland 16 is fixedly connected with the bearing seat 4 through a plurality of screws, and the assembly between the radial air bearing 5 and the bearing seat 4 is completed. The positioning rod 15 fixes the bending part 9 in the square slot 21, which can realize the fixed installation of the bending part 9 in the radial direction, effectively avoiding the displacement of the bending part 9 in the radial direction; the bearing gland 16 and the retaining table 17 limit the two ends of the radial air bearing 5, which can realize the fixed installation of the radial air bearing 5 in the axial direction, effectively avoiding the displacement of the radial air bearing 5 in the axial direction, thereby improving the stability of the radial air bearing 5 during use and ensuring the supporting effect.

[0053] When the radial air bearing 5 works, a plurality of first elastic fins 10 on the first elastic wave foil 6 are in contact with the inner hole wall of the bearing seat 4, and a plurality of second elastic fins 12 on the second elastic wave foil 7 are located on the inner side of each first elastic fin 10. When the radial force is not large, the radial force is borne by the elastic deformation of the first elastic wave foil 6, the second elastic wave foil 7 and the top foil 8 as a whole, and by the elastic deformation of the plurality of first elastic fins 10 themselves. When the radial force is too large, the first elastic fins 10 are displaced inward by being pressed by the radial force and can abut against the second elastic fins 12. At this time, the second elastic fins 12 are superimposed on the first elastic fins 10, the radial bearing capacity of the second elastic fins 12 is superimposed on the radial bearing capacity of the first elastic fins 10, and thus the radial force bearing capacity is greatly improved.

[0054] When the radial air bearing 5 is cooled, cooling gas can be introduced into the motor cavity through the cooling gas inlet and the cooling gas outlet on the shell 1. The cooling gas can enter the inner hole of the bearing seat 4 through a plurality of heat dissipation channels 14, cool the radial air bearing 5, carry and discharge the heat generated by the radial air bearing 5 when working outside the motor, has good cooling effect, fast heat dissipation, and prolongs the service life of the radial air bearing 5.

[0055] The above specific embodiments cannot be regarded as a limitation on the protection scope of the present application. Any alternative improvement or change made by those skilled in the art to the embodiments of the present application falls within the protection scope of the present application.

[0056] The details not described in the present application are well-known to those skilled in the art.

Claims

1. A radial air bearing system for a gas compressor, comprising a motor, with a compressor pump head connected to the end of the motor, the motor including a housing, a stator and a main shaft disposed within the housing, the two ends of the main shaft being supported by bearing seats, and a radial air bearing disposed between the bearing seats and the main shaft, characterized in that: The radial air bearing is an air-suspended radial air bearing, comprising a first elastic corrugated foil, a second elastic corrugated foil, and a top foil stacked sequentially from the outside to the inside. One end of each of the first elastic corrugated foil, the second elastic corrugated foil, and the top foil is provided with a bent portion as a fixed end, and the other end is a free end. The first elastic corrugated foil is provided with a plurality of outwardly inclined first elastic fins, and each first elastic fin is provided with a perforation around its periphery. The second elastic corrugated foil is provided with outwardly inclined second elastic fins corresponding to the position of each first elastic fin. The second elastic fins are stacked with the first elastic fins to improve the load-bearing capacity. The bearing housing has a boss on the side wall near the motor cavity. Several heat dissipation channels are arranged along the circumference inside the boss to connect the inner hole of the bearing housing with the motor cavity. The cooling gas in the motor cavity enters the inner hole of the bearing housing through the heat dissipation channels to cool the radial air bearing. The bent part is fixedly connected to the positioning rod, one end of the positioning rod is fixedly connected to the bearing cover, the bearing cover is fixedly connected to the bearing seat, the inner hole side wall of the bearing seat is provided with a slot that mates with the bent part and the positioning rod, and the inner hole side wall of the bearing seat away from the bearing cover is provided with a stop that mates with the radial air bearing. The second elastic fin is tilted in the opposite direction to the first elastic fin; The size of the first elastic fin is larger than the size of the second elastic fin; The perforation is a square hole, and each square hole is provided with two first elastic fins, and the two first elastic fins are tilted in opposite directions.

2. The radial air bearing system of a gas compressor according to claim 1, characterized in that: The first elastic foil, the second elastic foil, and the top foil are provided with anti-misalignment holes at corresponding positions.

3. The radial air bearing system of a gas compressor according to claim 1, characterized in that: The bent portion is provided with several fixing holes, and the positioning rod is connected to the bent portion by being inserted into the fixing holes through the pin on it.

4. The radial air bearing system of a gas compressor according to claim 3, characterized in that: The slot includes a connected square slot and an arc slot, with the bent part and positioning rod inserted into the square slot and the pin inserted into the arc slot.

5. A radial air bearing system for a gas compressor according to claim 3, characterized in that: The bearing cap, positioning rod, and pin are integrally formed.

6. The radial air bearing system of a gas compressor according to claim 1, characterized in that: The bearing cap is fixedly connected to the bearing housing by a number of screws.

7. A radial air bearing system for a gas compressor according to claim 1, characterized in that: The housing is provided with a cooling gas inlet and a cooling gas outlet.

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